Sheyket’s ex-boyfriend, Matthew Darby, 21, is being sought for the investigation, though he has not been charged or officially named a suspect. Sheykhet had a restraining order against Darby, and he was arrested last month for allegedly breaking into her apartment, according to the Associated Press.

“He did this because I left him and stopped answering his phone calls,” Alina wrote in the filing at the time.

“We don’t believe this is a random act of violence,” Pittsburgh Police Chief Scott Schubert tweeted on Monday. “There is no cont’d threat to Oakland residents & the university communities.”